GPU on Motherboard - no PCI transfers?

Accelerated Computing CUDA CUDA Programming and Performance
#1

Does anyone have experience of GPUs built into the motherboard?
Can these do CPU memory <-> GPU faster than using the PCI bus?
[I have seen some mention of nVidia motherbaords but these still describe PCI suggesting it is still used for host-GPU communication.]
Many thanks
Bill

    Dr. W. B. Langdon,
    Department of Computer Science,
    University College London
    Gower Street, London WC1E 6BT, UK
    http://www.cs.ucl.ac.uk/staff/W.Langdon/

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#2

With motherboard gpus it is always best to use zero-copy.
If you opt to not do so you have to do a memcopy as with conventional GPUs

#3

Thank you.

Do you have any figures for the actual transfer rates you get for real?

Which GPU (and CPU and motherboard) are you using?

Thanks again

Bill